More than 2 000,000 US cases per year
- Requires medical diagnosis
- Symptoms: Hyperpigmented scaly patches
- Color: Typically orange
- Location: Chest, back
- Treatment: Topical anti-yeast shampoos, ketoconazole 2% cream
Pityriasis versicolor is a superficial fungal infection caused by the skin yeast, Malassezia furfur. The fungus is found on the skin surface of most adults and thrives in warm and moist environment, especially on oily skin.
It is especially common on the back of young adults, particularly after sun exposure as the patches do not tan, creating uneven tanned skin. It is harmless and can be easily treated with topical products. However, once treated it may take months for the skin to get re-pigmented (gain color).
Pityriasis versicolor causes discrete hyperpigmented, orangey, scaly patches. This is because it often causes sharply defined spots that gather together to form large patches on the skin. Sometimes, these spot can also be brownish and scaly. It is usually located on areas with a lot of sebaceous and sweat glands, such as the chest and back.
What can I do?
Even though the disease is not contagious, it often needs to be treated with prescription medication.
Should I seek medical care?
You should get advice on application of anti-yeast shampoos from your healthcare provider or at a pharmacy.
Topical anti-yeast shampoos, such as Oliatum scalp shampoo, Selsum shampoo, and Nizoral shampoo, tend to work well to treat pityriasis versicolor. They can either be applied directly to the skin overnight (although this may cause irritation), or used daily in the shower. You should leave it on the skin for 5 minutes before rinsing. Continue treatments long term to reduce recurrence for 6-12 months. For smaller areas, ketoconazole 2% cream is a also good option. It is important to treat the entire upper body and arms even if lesions are not looking so prevalent out. The risk of relapse is high and you should start a treatment again.
American Academy of Dermatology. Tinea versicolor. Available at: https://www.aad.org/public/diseases/color-problems/tinea-versicolor
British Association of Dermatologists. Pityriasis Versicolor. Available at: http://www.bad.org.uk/shared/get-file.ashx?id=226&itemtype=document
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Specialist doctor from the University Hospital in Gothenburg, Sweden. I moved to the Bay Area in January 2013 and I attended the School of Public Health, UC Berkeley from 2013 to 2014 as a visiting PhD candidate. My PhD thesis is on Digital Health and so far I have published 4 peer review scientific papers. I founded First Derm in 2014.